MapStruct String to List映射 [英] MapStruct String to List mapping

问题描述

如何将String映射到List和List to String？

How would i map String to List and List to String?

考虑我们有以下classess

Consider we have following classess

class People{
    private String primaryEmailAddress;
    private String secondaryEmailAddress;
    private List<String> phones;
    //getter and setters
}

class PeopleTO{
    private List<String> emailAddress;
    private String primaryPhone;
    private String secondaryPhone;
    //getter and setters
}

在Dozer和Orika，我们可以使用以下代码行轻松映射

In Dozer and Orika, we can easily map with the following line of code

fields("primaryEmailAddress", "emailAddress[0]")
fields("secondaryEmailAddress", "emailAddress[1]")

fields("phones[0]", "primaryPhone")
fields("phones[1]", "secondaryPhone")

我如何在MapStruct中执行相同类型的映射？我在哪里可以找到关于mapstruct的更多示例？

How i can do the same kind of mapping in MapStruct? Where would i find more examples on mapstruct?

推荐答案

以下示例映射来自 emailAddress的元素列入 PeopleTO 进入 primaryEmailAddress 和 secondaryEmailAddress 属性。

The example below maps elements from the emailAddress list in PeopleTO into the primaryEmailAddress and secondaryEmailAddress properties of People.

MapStruct无法直接映射到集合，但它允许您实现方法在映射完成该过程后运行。我使用了一种这样的方法来映射 PeopleTO的 primaryPhone 和 secondaryPhone 属性到人中手机列表的元素。

MapStruct can't directly map into collections, but it allows you to implement methods that run after a mapping to complete the process. I've used one such method for mapping the primaryPhone and secondaryPhone properties of PeopleTO into elements of the phones list in People.

abstract class Mapper {
    @Mappings({
        @Mapping(target="primaryEmailAddress", expression="emailAddress != null && emailAdress.size() >= 1 ? emailAdresses.get(0) : null"),
        @Mapping(target="secondaryEmailAddress", expression="emailAddress != null && emailAdress.size() >= 2 ? emailAdresses.get(1) : null"),
        @Mapping(target="phones", ignore=true)
    })
    protected abstract People getPeople(PeopleTO to);

    @AfterMapping
    protected void setPhones(PeopleTO to, @MappingTarget People people) {
        people.setPhones(new List<String>());
        people.getPhones().add(to.primaryPhone);
        people.getPhones().add(to.secondaryPhone);
    }
}

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